Today we’re glad to present the last milestone preview of Kotlin 1.4 – 1.4-M3. In this post, we’ll guide you through the changes this preview brings to the Kotlin standard library. Other components are also getting updates in M3; we’ll cover them soon in another blog post with the release candidate version (1.4-RC), which will finalize the scope of Kotlin 1.4. The standard library changes in 1.4-M3 include: JVM libraries now come with the module-info descriptor Functional interfaces are added to the standard library New collection operations to cover real-life cases @Throws annota

Time flies, and today we want to present a few more powerful features of Kotlin 1.4 for your preview. Learn what Kotlin 1.4-M2 has in store, try it, and enjoy its features before they are officially released in Kotlin 1.4. We thank all of you who tried our first preview of Kotlin 1.4, shared your feedback, and helped make Kotlin better! Also many thanks to those who have already tried Kotlin 1.4-M2’s standard library improvements announced in our previous post. In this post, we'll highlight the new features and key improvements available in 1.4-M2: Support for sharing code in several ta

Registration for Kotlin Heroes #4 is open! It’s time to save the date for the next round, which will take place May 29, at 14:35 UTC. If you’re already excited to sign up, you can head directly over to the registration page on the Codeforces website. And if you’d like to learn more about Kotlin Heroes, take a look at the blog post below. (more…)

We keep working on Kotlin 1.4 and the next preview 1.4-M2 is just around the corner. Right now we’re ready to unveil some improvements from this preview; in this post, we’ll get you acquainted with the standard library changes. Here are some key improvements in the standard library in 1.4-M2: Changes to the existing API like updating signatures and introducing new constants More functions in the common library New functions for Arrays and Collections Property delegation improvements Even though Kotlin 1.4-M2 hasn’t been released yet, we’ve deployed its early version to the Kotlin playgrou

Hi folks! Today we have released a new version of the Kotlin kernel for Jupyter Notebook, and if you are experimenting with data — give notebooks with Kotlin kernel a try. One of the great things about Jupyter Notebook is its interactive nature. It allows you to quickly get familiar with your data, try out some ideas, and run some experiments. Kotlin kernel helps you iterate over your ideas even faster by featuring enhanced code completion. Previously, the kernel was already capable of completing local symbols, but with this update code completion works for global ones as well. Another n

We are happy to announce the first preview version of the new major release: Kotlin 1.4-M1. A few months ago, we published an announcement of what to expect in Kotlin 1.4. As the release approaches, we're offering you a preview in which you can try some of the new things for yourself. In this post, we'll highlight the following new features and key improvements available in 1.4-M1: A new, more powerful type inference algorithm is enabled by default. Contracts are now available for final member functions. The Kotlin/JVM compiler now generates type annotations in the bytecode for Java 8+ t

Today we're happy to present to you the latest version of Kotlin – 1.3.70. This incremental release doesn’t provide any major new features. However, we've tried our best to improve the existing functionality, fix issues, and even add experimental things for you to try. Here are the highlights of Kotlin 1.3.70: New functions and classes for Kotlin collections in the standard library. Various improvements in the IntelliJ Kotlin plugin: improved *.gradle.kts support, testing, debugging, completion, and so on. The Kotlin/JVM compiler now generates type annotations in the bytecode for Java 8 a

We have significantly improved the IDE support for Gradle Kotlin DSL scripts (*.gradle.kts files), and we’d like to share some details with you in this blog post. The changes will be publicly available in the Kotlin 1.3.70 release, but you can already try them by joining the Kotlin 1.3.70 EAP (Early Access Program). Some of you may have experienced the following scenario. You have a project built using Gradle Kotlin DSL scripts. You open the build.gradle.kts file to modify the project build logic, but suddenly your computer starts burning through CPU, your script looks like plain text (with

Registration for the next Kotlin Heroes coding challenge is open! This will be the third challenge for programmers co-hosted by JetBrains and Codeforces. Register now and save the date, February 27, 13:35 UTC. What is Kotlin Heroes, and why should you participate? Kotlin Heroes is a collaborative project from JetBrains, the creator of the Kotlin programing language, and Codeforces, the most popular platform for programming contests. Previous Kotlin Heroes challenges have attracted more than 700 competitors per event. The main objective for the participants is to provide correct solutions t

JetBrains and Touchlab partner to drive Kotlin Multiplatform adoption in 2020 At JetBrains, we’re very delighted to partner with our good friends at Touchlab to increase the adoption of Kotlin Multiplatform Mobile technology in 2020 and beyond. Touchlab has released a toolkit for getting started with Kotlin Multiplatform Mobile technology. It’s a self-contained GitHub project that you can use as a starting point or for evaluating the technology. We had the chance to review it before its general release and can say that we’re excited to share it with the Kotlin Multiplatform community! The f

The KotlinConf session recordings have now all been uploaded to the website, along with the slides if there were any. You can search for a particular talk, or you can watch all of them one by one with the KotlinConf playlist on JetBrains TV. Additionally, all the pictures from the conference are now available! They have been collected into albums and uploaded to the website. (more…)

Ktor 1.3 was released recently, and we’re happy to share the details with you in this blog post. Ktor consists of two parts: the server engine and a flexible asynchronous HTTP client. The current release focuses mainly on the HTTP client. Here you can find the complete changelog for this release. The client is a multiplatform library that supports JVM, JS, Android, and iOS and is now often used in cross-platform mobile applications. Our main goal for the next releases is to make the server engine multiplatform, too. The other areas we’re going to work on are: Improving integration w